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- 76
-
8.2
- LIQUID
NITROGEN
TRAP
NW
40
8.21
— DESCRIPTION
The
liquid
nitrogen
trap
is
mounted
on
the
intake
of
a
mechanical
roughing
pumps
33/63
m3-h 1.
Made
entirely
of
stainless
steel,
it
is
equipped
with
a
purge
system
in
its
lower
part.
8.22
— CHARACTERISTICS
AND
PART
NUMBER
Dimensions
:
See
figure
l.
Connections
:
NW
40
Pneurop.
Weight
:
3
kg.
Liquid
nitrogen
capacity
:
1
liter.
Conductance
at
1071
mbar
: 55
1.s7!,
~ Autonomy
(P << 1074
mbar)
: 15
hours
Pumping
speed
(water
vapor)
: 10
lest.
Part
number
:
786537.
8.23
— OPERATING
PRINCIPLE
-
The
liquid
nitrogen
trap
is
used
for
cryogenic
pumping
of
vapors
and
gases
with
condensation
temperatures
above
77
K
(temperature
of
liquid
nitrogen).
It
therefore
increases
pumping
speed
for
these
vapors
of
gases.
It
protects
the
pump
against
condensable
vapors
that
could
be
entrained
during
pumping.
It
prevents
oil
from
being
drawn
into
the
system
by
back
diffusion.
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